/**
* Unobtrusive scripting adapter for jQuery
*
* Requires jQuery 1.4.3 or later.
* https://github.com/rails/jquery-ujs
*/

(function($) {
// Make sure that every Ajax request sends the CSRF token
function CSRFProtection(xhr) {
var token = $('meta[name="csrf-token"]').attr('content');
if (token) xhr.setRequestHeader('X-CSRF-Token', token);
}
if ('ajaxPrefilter' in $) $.ajaxPrefilter(function(options, originalOptions, xhr){ CSRFProtection(xhr) });
else $(document).ajaxSend(function(e, xhr){ CSRFProtection(xhr) });

// Triggers an event on an element and returns the event result
function fire(obj, name, data) {
var event = $.Event(name);
obj.trigger(event, data);
return event.result !== false;
}

// Submits "remote" forms and links with ajax
function handleRemote(element) {
var method, url, data,
dataType = element.data('type') || ($.ajaxSettings && $.ajaxSettings.dataType);

if (fire(element, 'ajax:before')) {
if (element.is('form')) {
method = element.attr('method');
url = element.attr('action');
data = element.serializeArray();
// memoized value from clicked submit button
var button = element.data('ujs:submit-button');
if (button) {
data.push(button);
element.data('ujs:submit-button', null);
}
} else {
method = element.data('method');
url = element.attr('href');
data = null;
}
$.ajax({
url: url, type: method || 'GET', data: data, dataType: dataType,
// stopping the "ajax:beforeSend" event will cancel the ajax request
beforeSend: function(xhr, settings) {
if (settings.dataType === undefined) {
xhr.setRequestHeader('accept', '*/*;q=0.5, ' + settings.accepts.script);
}
return fire(element, 'ajax:beforeSend', [xhr, settings]);
},
success: function(data, status, xhr) {
element.trigger('ajax:success', [data, status, xhr]);
},
complete: function(xhr, status) {
element.trigger('ajax:complete', [xhr, status]);
},
error: function(xhr, status, error) {
element.trigger('ajax:error', [xhr, status, error]);
}
});
}
}

// Handles "data-method" on links such as:
// <a href="/users/5" data-method="delete" rel="nofollow" data-confirm="Are you sure?">Delete</a>
function handleMethod(link) {
var href = link.attr('href'),
method = link.data('method'),
csrf_token = $('meta[name=csrf-token]').attr('content'),
csrf_param = $('meta[name=csrf-param]').attr('content'),
form = $('<form method="post" action="' + href + '"></form>'),
metadata_input = '<input name="_method" value="' + method + '" type="hidden" />';

if (csrf_param !== undefined && csrf_token !== undefined) {
metadata_input += '<input name="' + csrf_param + '" value="' + csrf_token + '" type="hidden" />';
}

form.hide().append(metadata_input).appendTo('body');
form.submit();
}

function disableFormElements(form) {
form.find('input[data-disable-with], button[data-disable-with]').each(function() {
var element = $(this), method = element.is('button') ? 'html' : 'val';
element.data('ujs:enable-with', element[method]());
element[method](element.data('disable-with'));
element.attr('disabled', 'disabled');
});
}

function enableFormElements(form) {
form.find('input[data-disable-with]:disabled, button[data-disable-with]:disabled').each(function() {
var element = $(this), method = element.is('button') ? 'html' : 'val';
if (element.data('ujs:enable-with')) element[method](element.data('ujs:enable-with'));
element.removeAttr('disabled');
});
}

function allowAction(element) {
var message = element.data('confirm');
return !message || (fire(element, 'confirm') && confirm(message));
}

function requiredValuesMissing(form) {
var missing = false;
form.find('input[name][required]').each(function() {
if (!$(this).val()) missing = true;
});
return missing;
}

$('a[data-confirm], a[data-method], a[data-remote]').live('click.rails', function(e) {
var link = $(this);
if (!allowAction(link)) return false;

if (link.data('remote') != undefined) {
handleRemote(link);
return false;
} else if (link.data('method')) {
handleMethod(link);
return false;
}
});

$('form').live('submit.rails', function(e) {
var form = $(this), remote = form.data('remote') != undefined;
if (!allowAction(form)) return false;

// skip other logic when required values are missing
if (requiredValuesMissing(form)) return !remote;

if (remote) {
handleRemote(form);
return false;
} else {
// slight timeout so that the submit button gets properly serialized
setTimeout(function(){ disableFormElements(form) }, 13);
}
});

$('form input[type=submit], form input[type=image], form button[type=submit], form button:not([type])').live('click.rails', function() {
var button = $(this);
if (!allowAction(button)) return false;
// register the pressed submit button
var name = button.attr('name'), data = name ? {name:name, value:button.val()} : null;
button.closest('form').data('ujs:submit-button', data);
});

$('form').live('ajax:beforeSend.rails', function(event) {
if (this == event.target) disableFormElements($(this));
});

$('form').live('ajax:complete.rails', function(event) {
if (this == event.target) enableFormElements($(this));
});
})( jQuery );